Frédérique Motte
Service Astroph. (SAp), IRFU, CEA-Saclay (Gif-sur-Yvette, France)
Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris
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| « The HOBYS Key Program: When Herschel links high-mass star formation to cloud structure » |
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Frédérique Motte |
| With its unprecedented spatial resolution and high sensitivity in the far-infrared to submillimetre regime, Herschel revolutionizes our understanding of star formation. The HOBYS key program is an Herschel mapping survey dedicated to the formation of OB-type stars (Motte, Zavagno, Bontemps et al. 2010, 2012; see http://hobys-herschel.cea.fr. HOBYS aims at 1) discovering and characterizing the progenitors of high-mass stars, 2) making the link between the latter and their filamentary background, and 3) assessing the importance of triggering. Among the HOBYS highlights is the discovery of “mini-starburst ridges” defined as high-density dominating filaments supersonically contracting and efficiently forming clusters of high-mass stars (Hill et al. 2011; Hennemann et al. 2012; Nguyen Luong et al. 2013). Their existence is predicted by dynamical models of cloud formation such as converging flows and is favoring a (high-mass) star formation scenario involving gas flows and global infall. Cloud ridges have mass densities and star formation activities unusually high in the Milky Way and reminiscent of starburst galaxies (e.g. Nguyen-Luong et al. 2011; Louvet et al. 2014). Called mini-starburst ridges, they could be seen as "miniature and instant models" of extragalactic starbursts. |
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vendredi 17 octobre 2014 - 11:00 Amphithéâtre Henri Mineur, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |